Classes runtime

src/runtime/runtime.cc

Index: src/runtime/runtime.cc
diff --git a/src/runtime/runtime.cc b/src/runtime/runtime.cc
index 815bc4592a65600086955620e69c10557621eb25..130b28f73e133eacfb157334080ccaf02868ba52 100644
--- a/src/runtime/runtime.cc
+++ b/src/runtime/runtime.cc
@@ -361,6 +361,83 @@ RUNTIME_FUNCTION(Runtime_StoreToSuper_Sloppy) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_DefineClass) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(Object, name, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, super_class, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, constructor, 2);
+
+  Handle<Object> prototype_parent;
+  Handle<Object> constructor_parent;
+  bool has_constructor_parent = false;
+
+  if (super_class->IsTheHole()) {
+    prototype_parent = isolate->initial_object_prototype();
+  } else {
+    if (super_class->IsNull()) {
+      prototype_parent = isolate->factory()->null_value();
+    } else if (!super_class->IsSpecFunction()) {
+      // TODO(arv): Should be IsConstructor.
+      Handle<Object> args[1] = {super_class};
+      THROW_NEW_ERROR_RETURN_FAILURE(
+          isolate,
+          NewTypeError("extends_value_not_a_function", HandleVector(args, 1)));
+    } else {
+      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+          isolate, prototype_parent,
+          Runtime::GetObjectProperty(isolate, super_class,
+                                     isolate->factory()->prototype_string()));
+      if (!prototype_parent->IsNull() && !prototype_parent->IsSpecObject()) {
+        Handle<Object> args[1] = {prototype_parent};
+        THROW_NEW_ERROR_RETURN_FAILURE(
+            isolate, NewTypeError("prototype_parent_not_an_object",
+                                  HandleVector(args, 1)));
+      }
+      constructor_parent = super_class;
+      has_constructor_parent = true;
+    }
+  }
+
+  Handle<JSObject> prototype =
+      isolate->factory()->NewJSObject(isolate->object_function());
+  JSObject::SetPrototype(prototype, prototype_parent, false).Assert();
+
+  Handle<String> name_string = name->IsString()
+                                   ? Handle<String>::cast(name)
+                                   : isolate->factory()->empty_string();
+
+  Handle<JSFunction> ctor;
+  if (constructor->IsUndefined()) {
+    // TODO(arv): This should not use an empty function but a function that
+    // calls super.
+    Handle<Code> code(isolate->builtins()->builtin(Builtins::kEmptyFunction));
+    ctor = isolate->factory()->NewFunction(name_string, code, prototype, true);
+  } else {
+    ctor = Handle<JSFunction>::cast(constructor);
+    JSFunction::SetPrototype(ctor, prototype);
+    PropertyAttributes attribs =
+        static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
+    JSObject::SetOwnPropertyIgnoreAttributes(
+        ctor, isolate->factory()->prototype_string(), prototype, attribs)
+        .Assert();
+  }
+
+  Handle<Symbol> home_object_symbol(isolate->heap()->home_object_symbol());
+  JSObject::SetOwnPropertyIgnoreAttributes(ctor, home_object_symbol, prototype,
+                                           DONT_ENUM).Assert();
+
+  if (has_constructor_parent) {
+    JSObject::SetPrototype(ctor, constructor_parent, false).Assert();
+  }
+
+  JSObject::AddProperty(prototype, isolate->factory()->constructor_string(),
+                        ctor, DONT_ENUM);
+
+  return *ctor;
+}
+
+
 RUNTIME_FUNCTION(Runtime_IsExtensible) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);